Tizliz
After all, no-one is going to pay for negative reviews :-)
Yes they do, on a rival’s site. I watch a TV Programme about a shop that was put out of business by a rival doing this and they couldn’t do anything about it.
I don’t think anyone can review anonymously any more (books) but some years ago I certainly heard of a fairly well known author writing a bad review for a rival’s novel - and actually admitting that she did such things!
An author friend of mine was once terribly upset by a scathing Amazon review of her novel. However, I knew at once who’d written it - a less successful author who’d once belonged to the same writing group as I did, and had written me (an aspiring author at the time) two positively poisonous letters that had me in tears. Her style of writing almost screamed from the page.
So I was able to tell my friend that it was all down to the horrible old bag’s jealousy.


. She always has a "marvellous" time wherever she goes, the food is always "fabulous" the wine "superb" and hotels seem to have "views to die for". 